Operative Dentistry Division, Conservative Dental Sciences Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia; Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; Global COE, International Research Center for Molecular Science in Tooth and Bone Diseases, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Global COE, International Research Center for Molecular Science in Tooth and Bone Diseases, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Dent Mater. 2014 Sep;30(9):993-1004. doi: 10.1016/j.dental.2014.05.010. Epub 2014 Jun 16.
Self-adhesive resin cements have been recently introduced; however, there is little data available on their long-term performance. In this in vitro study, swept-source optical coherence tomography (OCT) at 1310 nm center wavelength was used for monitoring adaptation of indirect resin restorations after thermal cycling.
Resin inlays were luted to class-I cavities of extracted human teeth using three resin cements; Clearfil SA Luting (SA; Kuraray), Bistite II DC or Multibond II (Tokuyama Dental). Each cement was applied with or without pre-coating of dentin by a self-etch adhesive (Clearfil SE Bond) and a low-viscosity microfilled resin. OCT imaging was performed after 24 h, after 2000 and after 10,000 thermocycles (n=5). Selected samples were sectioned for interfacial observation by confocal laser scanning microscope (CLSM). Floor adaptation (percentage) was analyzed by software on 20 B-scans throughout each specimen, and subjected to statistical analysis by three-way ANOVA test at a significance level of 0.05.
Resin cement type, resin coating and thermal aging all significantly affected adaptation (p<0.05). Initially, SA showed the highest adaptation; however, thermal aging significantly affected its sealing. The best results for all the cements were consistently achieved when the resin coating technique was applied where no deterioration of interfacial integrity was observed in the coated groups. CLSM closely confirmed OCT findings in all groups.
OCT could be used for monitoring of composite inlays with several interfacial resin layers. The application of a direct bonding agent in the resin-coating technique improved interfacial sealing and durability of all resin cements.
自黏树脂黏固剂最近已被推出，但有关其长期性能的数据却很少。在这项体外研究中，我们使用 1310nm 中心波长的扫频光源光学相干断层扫描（OCT）来监测热循环后间接树脂修复体的适应性。
使用三种树脂黏固剂（Kuraray 的 Clearfil SA Luting（SA）、Bistite II DC 或 Multibond II（Tokuyama Dental））将树脂嵌体黏固于从人牙中提取的 I 类洞型中。每种黏固剂均未使用或使用自酸蚀黏结剂（Clearfil SE Bond）和低黏度微填料树脂对牙本质进行预处理。在 24 小时、2000 次热循环和 10000 次热循环后（n=5）分别进行 OCT 成像。对部分样本进行界面观察，使用共聚焦激光扫描显微镜（CLSM）。通过软件分析每个样本中的 20 个 B 扫描，分析其底面适配度（%），采用三因素方差分析进行统计分析，显著水平为 0.05。
黏固剂类型、树脂涂层和热老化均显著影响适配度（p<0.05）。SA 初始适配度最高，但热老化明显影响其密封效果。当应用树脂涂层技术时，所有黏固剂均能获得最佳效果，其中涂层组未见界面完整性恶化。CLSM 结果与 OCT 结果在所有组中均密切吻合。
OCT 可用于监测具有多个界面树脂层的复合嵌体。在树脂涂层技术中应用直接黏结剂可提高所有树脂黏固剂的界面密封性和耐久性。
